LT1963

Features:

n Optimized for Fast Transient Response
n Output Current: 1.5A
n Dropout Voltage: 340mV
n Low Noise: 40mVRMS (10Hz to 100kHz)
n 1mA Quiescent Current
n No Protection Diodes Needed
n Controlled Quiescent Current in Dropout
n Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
n Adjustable Output from 1.21V to 20V
n <1mA Quiescent Current in Shutdown
n Stable with 10mF Output Capacitor
n Reverse Battery Protection
n No Reverse Current
n Thermal Limiting


Application

n 3.3V to 2.5V Logic Power Supplies
n Post Regulator for Switching Supplies


Pinout




Specifications

IN Pin Voltage ......................................................... ±20V
OUT Pin Voltage ...................................................... ±20V
Input to Output Differential Voltage (Note 2) .......... ±20V
SENSE Pin Voltage .................................................. ±20V
ADJ Pin Voltage ......................................................... ±7V
SHDN Pin Voltage .................................................... ±20V
Output Short-Circuit Duration ............................ Indefinite
Operating Junction Temperature Range 45°C to 125°C
Storage Temperature Range ................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C


Description

The LT®1963 series are low dropout regulators optimized for fast transient response. The devices are capable of supplying 1.5A of output current with a dropout voltage of 340mV. Operating quiescent current is 1mA, dropping to <1mA in shutdown. Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. In addition to fast transient response, the LT1963 regulators have very low output noise which makes them ideal for sensitive RF supply applications.

Output voltage range is from 1.21V to 20V. The LT1963 regulators are stable with output capacitors as low as 10mF. Internal protection circuitry includes reverse battery protection, current limiting, thermal limiting and reverse current protection. The devices are available in fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable device with a 1.21V reference voltage. The LT1963 regulators are available in 5-lead TO-220, DD, 3-lead SOT-223 and 8-lead SO packages.